Manufacture of naphthols



ess in Which solid sodium naphtholate and RATION OF NEW YORK.

MANUFACTURE 0F NAPHTHOLS.

1,381,2so. Specification of Letters Patent. Pa tqgn'jggd Jung 14 No Drawing. Application filed November 23, 1916. Serial No. 132,953.

To all whom it may concern Be it known that 1, subject of the Czar of Russia, residing at rovements in the ianut'acture or" Naphthols, lowing is a specification. ydroxynaphthoicl called naphthol-carboxylic acids) have been made hitherto by a directly synthetic proccarbonic acid gas were heated under pressure in an autoclave.

considerable expense or energy and money; and, in spite 0t numerous efiorts on the part or" able chemists, no thoroughly satisfactory and inexpensive process for producing this substance has hitherto been developed. l have discovered a new substance, properly characterized as a basic alkali naphthoate. and a process for making the same; and I have found that this new substance is a perfect substitute for solid sodium naphtholate in the process above mentioned for the manufacture of hydroxyna hthoic acids (or naphthol-carboxylic acid'si as Well as for other purposes unnecessary to be stated at length. dy invention also covers the basic alkali naphtholate as a novel sition of matter useful for the above and her purposes.

firoadly speaking,

mass is fused, and continu- The following is a preferred example of proportions and temperaam not necessar- Fifteen hundred pounds of sodium salt of naphthalene-beta.-sulfonic acid are fused up to about 325 C.

naphthalene-beta-sulfonic acid.

mass.

yellow crystalline solid, easily soluble both in Water and alcohol. Upon testing, this is found to agree in chemical composition with the empirical formula "v i 2 a end in properties with a substance represented by the following graphic rormulaz- I call this basic sodium naphtholate. course, if-potassium be substituted for sodium, the basic factor will be KQH.

The above process can be carried on in an open vessel, and the resulting novel reagent is quite inexpensive to produce as compared with the solid sodium beta-naphtholate hitherto used. It is an efi'i'cient substitute the production of hydroxynaphthoic (or naphthol-carboxvlic) acids,

naphtholate which consists in mixing fifteen parts of sodium salt of naphthalene-betasulfonic acid with eleven parts of caustic soda, fusin at a temperature not higher than 350 and removing the upper layer formed on prolonged heating.

3. As a novel composition of matter a basic alkali naphtholate, substantially as described.

4. As a novel composition of matter a yel- 5 low crystalline substance, readily soluble in water and alcohol and conforming substantially to the following composition- 5. The process of making basic sodium naphtholate which consists in mixing fifteen 15 parts of sodium salt of naphthalene-beta- DR. LEO F. CHEBOTAREF.

Witnesses:

F. Joan LINGE, A. R. TANNER. 

